Heating device for cooking utensils.



T. W. MQKENZIE. HEATING DEVICE FOR COOKING UTBNSILS. APPLICATION FILEDSEPT. 20, 1912.

1 69,344, Patented Aug. 5, 1913:

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THOMAS W. MCKENZIE, OF INDIANAPOLIS, INDIANA. v

HEATING DEVICE-FOR COOKING UTENSILS.

Specification of Letters Patent.

Patented Aug. 5,1913.

Application filed September 20, 1912. Serial No. 721,498.

To all whom it may concern.

Be it known that I, THOMAS WV. MCKEN- are, a citizen of the UnitedStates, residing at-Indianapolis, in the county of Marion and State ofIndiana, have invented certain new and useful Improvements in HeatingDevices for Cooking Utensils, of which the following is a specification.

This invention relates to certain means to be used in connection withwash boilers, stew kettles, coffee and teapots and similar cookingutensils; and the object of the invention is to provide utensils of theabove character with means whereby the contents of such utensils may bebrought more quickly to the boiling point than now obtains in thepresent constructions used in such utensils.

I accomplish the above objectof the invention by means of theconstruction shown in the accompanying drawings, forming a part hereof,in which Figure 1 is a view part-1y in side elevation and partly insection of an ordinary teakettle. Fig. 2 is an underside plan view ofthe construction shown in Fig. 1. Fig. 3 is a fragmentary detailsectional view through the lower portion of the kettle, on the dottedline 33 in Fig. 1.

Referring to the drawings, 10 represents the body of an ordinary andwell-known teakettle, such as is ordinarily used around the kitchen; 11the lid; 12 the bail and 13 the spout.

member 14 is provided with suitable slots or openings 15, preferablyarranged in parallel planes. The openings 15 form passageways leading tothe chambers 17 formed within the tubes 16. The ends of the tubes 16 areclosed by means of the end-walls 17 and the tubes communicate with theslots 15 in the bottom member 14. The internal diameters of the tubes 16are somewhat greater than the width of the slots 15, and the tendency ofthese enlarged tubes 16, by afford- The body 10 is provided withv theusualbottom member 14. The bottom ing expansion of the heated air, is toaccelerate the movement of the flame through the slots 15 into the tubes16. I have found by experiment that if the slots 15 and tubes 16 are ofthe same diameter the movement of the flame and heated air will not beas rapid in and out of said chambers as it is where the chambers arelarger than said openings. I have also found by experiment that with theuse of my invention in the above noted kettle that a certain volume ofwater can be heated to the boiling point in about one-half the time thatis required in the old and well-known kettle now commonly 1n use.

In order toaccelerate the movement of the flame and hot air toward theslots 15 I mount the bottom member 1% on an angle, the highest pointbeing at or near the center of the kettle, as clearly shown in Fig. 3 ofthe drawings.

\Vhile I have shown two of the tubes 16 in the drawings, I have nodesire to be limited to this number, nor is it necessary that the' tubesbe placed in parallel planes, for the reason that equally as goodresults can be obtained by placing the tubes at right angles to eachother.

Having thus fully described my said invention, what I claim as new andwish to secure by Letters Patent, is

Autensil provided with long narrow openings in the bottom, and meansarranged within said utensil to form closed chambers over said openings,said chambers having greater diameters than the widths of said openings.

In witness whereof, I, have hereunto set my hand and seal atIndianapolis, Indiana, this, 7th day of September, A. D. one thousandnine hundred and twelve.

THOMAS IV. MCKENZIE. [1,. s] lVitnes'ses:

F. W. Vonnunn,

L. B. WOERNER.

